Fluid-pressure motor



Patented Aug. 25, 1925.

OFFICE.

ELMER Gr. GARTIN, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY, A CORPORATION 0F MASSACHUSETTS.

FLUID-PRESSURE MOTOR.

Application filed July 6, 1920. Serial No. 394,320.

To all whom t may concern.'

Be it known that I, ELMER G. GARTIN, a citizen of the United States, residing at Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements in Fluid-Pressure Motors, of which the following is a full, clear, and eXact specification.

lily invention relates to fluid pressure motors and more particularly to fluid pressure motors of the percussive type which are employed for rock drilling purposes.

An object of my invention is to provide an improved fluid pressure motor. A, further object of my invention is to provide an improved fluid pressure motor of the valve controlled percussive type. A still further object of my invention is to provide an improved fluid pressure percussive motor having the rotation mechanism, the cleansing fluid supply mechanism and the valve mechanism thereof very compactly and conveniently arranged. Other objects of my invention will appear from the subsequent specification and claims.

In the accompanying drawings I have shown for purposes of illustration one embodiment which my invention may assume in practice.

In these drawings,-

Fig. 1 is a cent-ral longitudinal section through the cylinder of the illustrative embodiment of my motor. certain parts being broken away to show the construction an the fluid distribution ports being shown diagrammatically for clearness.

Fig. 2 is a similar view with the exception that the valve and piston are shown in elevation and in different positions and the chuck housing is' not broken away.

In the illustrative embodiment of my invention, I have shown it incorporated in a device in which a cylinder 1 has its opposite ends closed by heads 2 and 3 and to the front head 3 of which a chuck housing 4 containing suitable rotation means hereinafter described is attached, while at the rear end 2 oscillation imparting mechanism and the requisite valve mechanism are located in a second housing indicated by 5. The cylinder 1 has a cylindrical bore 6 in which a piston 7 reciprocates, this piston having an enlarged head 8 fitting in the bore 6, a striking bar 9 provided with straight longitudinally extending grooves 10, and a second hollow extension 11 upon the opposite side of the head 8. Arranged in the chuck housing 4 is a chuck member 12 having` a polygonal bore 13 extending through the front end thereof and adapted to receive a similarly shaped shank 14 of a drill steel 15. Rotatably mounted within the chuck member 12 and at the rear end thereof is a` pawl carrier 16 having pawls 17 cooperating with internal teeth 18 formed in the rear end of the chuck member 12. rlhe pawl carrier is, as usual, provided with straight splines 19 adapted to cooperate with the grooves 10 and, upon oscillation of the piston 7, as will later be described, cause a step by step rotation of the drill steel 15.

The rear housing` member 5 is provided with a bore 2O which is of varying diameter throughout its length having formed about its periphery a series of annular grooves 21, 22. 2, 24, and 25 for the purpose of cooperating as will later be described in the distribution of fluid to the cylinder 6 in order to actuate the piston 7 Reciprocable within the bore 20 is a valve member 26 having` suitable shoulders or rings 27, 28, and 29 formed thereon to cooperate with the several grooves 21 to 25 inclusive in the fluid distribution. Of the several grooves, grooves 21 and 25 communicate with the eX- haust passages 30 and 31 while grooves 22 and 24 communicate with passages 32 and 33 respectively leading to the front end and the rear end of the cylinder 6. The groove 23 is in constant communication with the live air passage 34, the supply to which is controlled by a valve 35 having manual control means of a well-known type and not shown herein. Between the shoulders or rings 27 and 28, and 28 and 29 are formed annular grooves in the periphery of the valve member 26 which serve to alternately connect one of the exhaust passages 30 and 31 with one of the passages 32 and 33 leading to the opposite ends of the cylinder while simultaneously connecting the other of the passages 32 or 33 to the live fluid groove 23. For the purpose of throwing the valve, passages 36 and 37 lead from points in the cylinder such that they are uncovered after the piston has made a certain predetermined portion of its stroke in either direction and Conduct duid to the outsides of the shoulders or rings 27 and 29. As, With the eXception of its location, valve mechanism of the type described is Wellknown, it is believed that further description of the operation will be unnecessary.

The tail rod 1l of the piston 7 is bored out as shown at 88 and provided with spirally arranged splines of which but one is shown because of the line of section and this one is indicated by the numeral 39. A rifle bar 40 having spirally disposed grooves 41 and 42 is formed integrally with the rear head member 43 and the latter is rigidly secured by means of side rods 44 to the cylinder member. Extending longitudinally through the rifie bar 40, the piston 7, and through the chuck housing and chuck is a cleansing fluid supply'tube 45. It will be obvious that as the piston 7 is reciprocated, it Will be oscillated through a predetermined angle by the co-action of the grooves 41 and 42 and their co-acting splines 39.

From the foregoing description, it Will be evident that I have provided a drill in Which the rotation mechanism, distributing valve mechanism, and the cleansing fluid distribution system, are of improved construction and very compactly and conveniently arranged.

While I have in this application specifically described one embodiment which my invention may assume in practice, it will be understood that this form of the Isame is for illustrative purposes and that the invention maybe modiiied and embodied in various other forms Without departing from the spirit or scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling apparatus, the combination comprising a cylinder member, a piston operating therein, a tool adapted to be impinged by .said piston, means for causing rotation of said tool comprising a stationary rifle bar and a cooperating tail rod carried by said piston, and valve mechanism for controlling the fluid distribution to and from the cylinder member for actuating said piston including' a fluidoperated valve surrounding said rifle bar and tail rod.

2. In a drilling apparatus, the combination comprising a cylinder member, a piston therein having a projecting portion, means for causing rotation of a tool operated on by the piston comprising a stationary rifle bar cooperating with said projecting portion substantially throughout its length, and a valve surrounding the rifle bar and controlling the flow of motor fluid to the cylinder member for actuating .said piston.

3. In a drilling apparatus, the combination comprising a cylinder member, a piston operating therein, a tail rod projecting from said piston, means for causing' said piston to oscillate cooperating With said tail rod, and

means surrounding said tail rod for distributing motive fluid to the opposite ends of said cylinder.

4. In a drilling apparatus, the combination comprising a cylinder member, a piston operating therein, a tool acted upon by said piston, a tail rod projecting from said piston, rotation means for said tool comprising a member cooperating with said tail rod, and means surrounding said tail rod for distributing motive fluid to the opposite ends of said cylinder.

5. In a drilling apparatus, the combination comprising a cylinder member, a piston operating therein having a tail rod, a tube for supplying cleansing fluid to a tool operated on by said piston, and means surrounding said tube and disposed concentrically to said tail rod for controlling the flow of motive fluid supply to the cylinder member for actuating said piston and for causing rotation of the tool.

6. In' a drilling apparatus, the combination comprising a cylinder member having a head and a valve casing member cooperating to form a valve chest, means for closing the outer end of said cylinder, a piston reciprocable in said cylinder having a tail rod extending in one position of the piston through said valve chest, a fluid pressure actuated valve telescopically arranged with respect to the tail rod and having continuous engagement with the same, and means disposed parallel to said valve and cooperating` With said rod for causing tool rotation.

7. In a drilling apparatus, the combination comprising a cylinder, a piston therein, means for effecting rotation of a tool operated on by the piston comprising a member extending rearwardly fromv the piston, and means directly controlled by fluid pressure surrounding said member for controlling the distribution of motive fluid to the cylinder to control the reciprocation of said piston.

8. In a drilling apparatus, the combination comprising a cylinder member, a pisto'n operating therein, a tail rod on said piston, means cooperating with said piston to eifect rotation of the tool operated on by the piston concentrically arranged with said tail rod, and valve mechanism for controlling the supply and exhaust of motive fluid to and from the cylinder concentrically arranged with said tail rod and said means.

9. Ina drilling apparatus, a cylinder, a piston therein, a projection on said piston of less diameter than said piston, means cooperating `with said projection to effect rotation of a tool acted on by said piston, and concentricallyl arranged means for distrib- .uting fluid'to said cylinder.

10. In a drilling apparatus, a cylinder, a'

piston therein, a lprojection on said piston of -less diameter than said piston, telescopic means cooperating with said projection to effect rotation of a tool acted on by said piston, and concentrically arranged means for distributing fluid to said cylinder.

11. In a drilling apparatus', a cylinder, a piston therein, a projection on said piston of less diameter than said piston, and coaxial therewith, means cooperating With said projection to effect rotation of a tool acted on by said piston, and concentrically arranged means for distributing 'fluid to said cylinder.

12. In a drilling apparatus, a cylinder, a piston therein, a projection on said piston of less diameter than said piston and coaxial therewith, means cooperating With said projection in eecting rotation of a tool acted on by said piston, concentrically arranged means Jfor distributing fluid to the cylinder, and coaxially arranged means for conducting a cleansing fluid to a hollow drill steel.

13. In a drilling apparatus, a cylinder, a piston therein, oppositely disposed procontrol angular movement of said pistoia,`

and a fluid distributing valve slidably mounted on the outside of said portion.

15. A drilling apparatus comprising a cylinder, a piston therein, and a plurality olf telescopic members arranged at one end of said apparatus, one of said members being carried by said piston, said members providing means igor controlling reciprocation and angular movement of said piston. ln testimony whereof I ai-lin my signature.

ELMER G. GARTIN 

